HQRP 3300mAh APS Battery for iROBOT Roomba 510 / 530 / 535 / 540 / R3 [Vacuum Cleaning Robot] Replacement plus HQRP Coaster HQRP&reg; Green Line APS Battery Pack plus HQRP&reg; Coaster; Battery Type: Ni-MH Rechargeable Battery Pack; Capacity: 3300mAh; Volt: 14.4V. High Drain! 15% more charging cycles compared to the standard battery! 10% more capacity and extra power compared to the standard battery! Up to 2.5 hours cleaning time! 100 days warranty!